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A combination of computational models and theoretical methods have been used to study the contact of hip resurfacing devices under normal/central and edge loading conditions. The techniques have been developed and are based on the finite element method. It has been found that the study of hip joint modelling, numerical methodologies of mechanical wear simulations and shakedown analysis can be developed to study the contact mechanics and biotribology of hip resurfacing devices under central and edge loading conditions. Each method developed in this study provides a unique platform to study these problems. [ABSTRACT FROM AUTHOR]

Friction is involved in dental contact stability, in wear and deterioration of both restoration materials and teeth. In clinical terms, it may influence the occlusal trauma phenomena, leading to a nonaxial tooth loading and damaging the periodontal support. Therefore, one must determine the coefficient of friction in dynamic conditions based on the controlled applied chewing force. In this paper we propose an experimental setup, that contains: actuator with an extracted tooth on a glass plate contact, loading device, displacement transducer, frequency function generator, memory oscilloscope, computer, data acquisition board, image and film programs. Physically, the normal and tangential forces and the number of loading cycles are recorded in dynamic regime. The experimental results of the contact between tooth and glass plate, were obtained for two frequencies: 1 Hz and 2 Hz. The friction coefficient obtained for the two situations had values of 0.186 and 0.226, near that indicated in literature. The research of dental contacts and stresses which appear in the whole masticatory system, can lead to a better understanding of various dental diseases, but also to an increase in preventing and treating them. [ABSTRACT FROM PUBLISHER]